gralkor

defmodule Mix.Tasks.Compile.GralkorPriv do
  @moduledoc false

  use Mix.Task.Compiler

  @priv_dest "priv/server"
  @skip_dirs ~w(.venv .pytest_cache __pycache__ wheels tests mutants tmp)
  @skip_ext ~w(.pyc)

  @impl true
  def run(_args) do
    src = Path.expand("../server", File.cwd!())

    if File.dir?(src) do
      dest = Path.expand(@priv_dest, File.cwd!())
      File.rm_rf!(dest)
      File.mkdir_p!(dest)
      copy_tree(src, dest)
      :ok
    else
      :noop
    end
  end

  defp copy_tree(src, dest) do
    for entry <- File.ls!(src), keep?(entry) do
      src_path = Path.join(src, entry)
      dest_path = Path.join(dest, entry)

      if File.dir?(src_path) do
        File.mkdir_p!(dest_path)
        copy_tree(src_path, dest_path)
      else
        File.cp!(src_path, dest_path)
      end
    end
  end

  defp keep?(entry) do
    entry not in @skip_dirs and Path.extname(entry) not in @skip_ext
  end
end